Signal lamp



FIG. 1 is a top, front perspective view of a signal lamp showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a left side elevational view thereof; and

FIG. 8 is a cross-sectional view thereof as taken along line 8--8 of FIG. 2. 

The ornamental design for a signal lamp, as shown and described. 